Guide to Assessing Road Traffic Noise

7/30/2019 Guide to Assessing Road Traffic Noise

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Guid t assssing rad-trac

nis using NZS 6806 r stathighwa asst imprmnt

prjcts

Version 1.0, October 2011

This guide describes the processes to be used onNZTA asset improvement projects or assessing and,

where required, determining appropriate mitigation

or road-trac noise. These processes are based on

NZS 6806:2010. The guide also gives eect to the

NZTAs state highway project development and

delivery standards, in particular SM030 minimum

standard Z/19 Social and Environmental

Management.


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Guid t assssingrad-trac nisusing NZS 6806 rstat highwa asstimprmnt prjcts

1.0NZ Transport Agency

October 2011

ISBN 978-0-478-38042-2 (online)

ISBN 978-0-478-38043-9 (print)

Copyright: 2011 NZ Transport Agency

National Oce

50 Victoria Street

Private Bag 6995

Wellington 6141

New Zealand

T 64 4 894 5400F 64 4 894 6100

Front cover image:

Transparent noise barrier by SH1 at St Marys Bay, Auckland

Cntnts

Intrductin 1

Assssmnt mthd 3

Trminlg 4

NZTA prcsss 6

Rprting 10

Bst practicabl ptin 12

Watriw Cnnctin 16

Scp wrks 17

Dsignatin cnditins 18


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NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0 1

Intrductin

BackgroundThe NZ Transport Agency (NZTA) aims to be a good neighbour, taking social and environmental

responsibility seriously, including management o noise. This is reected in external and internal

strategy and policy documents that the NZTA is required to implement, including the NZTAs

Environmental plan1. These documents are consistent with the requirements o the Land Transport

Management Act 2003 and Resource Management Act 1991 (reer to fgure 1).

1 Transit New Zealand (2008)

Environmental plan, version 2.

www.nzta.govt.nz

The NZTAs Environmental plan sets ormal objectives regarding noise rom the state highway

network, including:

N2 Determine reasonable noise requirements when seeking new or altering existing

designations including when designating existing local roads by using RMA procedures

New Zealand Standard (NZS) 68062 prescribes the methods and criteria that the NZTA uses to

ulfl this objective (except where existing designation conditions require compliance with another

standard).

NZS 6806 was published by Standards New Zealand on 30 April 2010 and is a process-based

standard or measuring, predicting, assessing and, where required, determining appropriate

mitigation or road-trac noise.

2 Standards New Zealand (2010)

NZS 6806:2010Acoustics road-

trafc noise new and altered roads.

www.standards.co.nz

FIGURe 1 Rlatinship this guid t k NZTA plic and stratg

dcumnts and thr guids

Land

Transpor

tManagem

entA

ct2003 ResourceM

anagement

Act1991

Stat highwa nis barrir

dsign guid

Guid t stat highwa

rad surac nis

Stat highwa guid t acustics

tratmnt buildings

Statmnt Intnt 20112014

Guid t assssing rad-trac nis using Nw Zaland Standard 6806

r stat highwa asst imprmnt prjcts

Nw Zaland Standard 6806:2010

Acoustics road-trac noise new and altered roads

Stat Highwa enirnmntal Plan

Grnmnt

Plic Statmnt

2012/13 2018/19

IMPROVING ENVIRONMENTAL SUSTAINABILITY AND PUBLIC HEALTH IN NEW ZEALAND

ENVIRONMENTAL PLAN

VERSION 2 JUNE 2008
http://www.nzta.govt.nz/resources/environmental-policy-manual/docs/environmental-plan.pdfhttp://www.standards.co.nz/http://www.standards.co.nz/http://www.nzta.govt.nz/resources/environmental-policy-manual/docs/environmental-plan.pdf


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2 NZ Transprt Agnc | Road-trac noise assessment | SP/M/023 | October 2011 / version 1.0

Purpose o this document

This guide describes the processes to be used on NZTA projects or assessing and, where required

determining appropriate mitigation or, road-trac noise, based on NZS 6806. The aim is to

consistently and eciently apply NZS 6806, within the ramework o the NTZAs Project

management manual (SM011)3, State highway proessional services contract proorma manual

(SMO30)4, and minimum standards Z/65, Z/186, Z/197, Z/208, Z/219 and PSG/1310. Specifcally,

this guide is to be used or road-trac noise assessment as required by Z/19. Some o the

minimum standards are to be updated or consistency with this noise assessment process. This

guide should be read in conjunction with NZS 6806.

NZS 6806 should result in better social and environmental outcomes or stakeholders, with

integrated design o noise mitigation measures. However, or high-risk improvement works (reer

to page 7 and the Risk management process manual 11), signifcantly more eort is needed rom the

project team at an earlier stage in the process, compared with previous assessments using the

Transit guidelines12. This guide is aimed in particular at NZTA project managers, acoustics

specialists and planners:

NZTAproject managers now need to schedule and budget or the dierent processes brought

about by NZS 6806.

Acoustics specialists need to adopt new assessment methods, and are now required to prepareinormation about mitigation options in new ormats and provide analysis o the acoustics

beneftcost ratio (BCR).

Planners need to adapt the way designation conditions or noise are drated.

Foreachproject,asuitably qualied expert (such as an environmental manager, planner or

other person with a holistic viewpoint) now has responsibility or the fnal determination o the

best practicable option (BPO) or noise mitigation.

Supporting tools, templates and examples or the application o NZS 6806 are available on the

NZTAs Transport Noise website: www.acoustics.nzta.govt.nz. This includes an online eLearning

training module on road-trac noise, including application o NZS 6806.

NZTA Transport Noise website

NZTA eLearning NZS 6806 case study

4 NZTA (2011) State highway

proessional services contract

proorma manual (SM030).

www.nzta.govt.nz

7 NZTA (2010) Minimum standard

Z/19 Social and Environmental

Management. www.nzta.govt.nz

3 NZTA (2010) Project

management manual (SM011).

www.nzta.govt.nz

10 NZTA (2010) StandardProessional Services Guideline

PSG/13 Social and Environmental

Management. www.nzta.govt.nz

11 NZTA (2004) Risk management

process manual. www.nzta.govt.nz


Z/20 Project Feasibility Reports.

www.nzta.govt.nz


Z/18 Scoping Report.

www.nzta.govt .nz


Z/6 Scheme Assessment Report.

www.nzta.govt.nz


Z/21 Large and Complex Projects

I&R to D&PD Phase Handover

Checklist.www.nzta.govt.nz

12 NZTA (1999) Appendix 6:

Guidelines or the management o

road trac noise state highway

improvements in Planning policy

manual. www.nzta.govt.nz
http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/sm030-z19-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/project-management-manual/pmm.htmlhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/guidelines/docs/sm030-psg13-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/risk-management-process-manual/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z20.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z6.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z21.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z21.pdfhttp://www.nzta.govt.nz/resources/planning-policy-manual/docs/planning-policy-manual-noise-guidelines-1999.pdfhttp://www.nzta.govt.nz/resources/planning-policy-manual/docs/planning-policy-manual-noise-guidelines-1999.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z21.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z6.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z18.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/Z20.pdfhttp://www.nzta.govt.nz/resources/risk-management-process-manual/http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/guidelines/docs/sm030-psg13-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/project-management-manual/pmm.htmlhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/standards/docs/sm030-z19-v2-1mar10.pdfhttp://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/http://www.acoustics.nzta.govt.nz/


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Assssmnt mthd

BackgroundRoad-trac noise rom state highways has previously been assessed using the Transit guidelines

(appendix 6 in the NZTAs Planning policy manual). One o the weaknesses o the Transit guidelines

is that they oten led to noise mitigation solutions to achieve perect compliance with the specifed

noise limits, resulting in poorly integrated designs and at the expense o value-or-money. In some

instances this has resulted in poor visual and urban design outcomes, and construction o

substantial barriers or the sake o 1 dB attenuation, which is an insignifcant beneft.

The NZTAs Value Assurance Committee13 has provisionally adopted NZS 6806 or all new and

altered state highway projects (except where existing designation conditions require compliance

with another standard). NZS 6806 is to be used in place o the Transit guidelines. This decision is

subject to review ollowing urther verifcation that value-or-money solutions do result rom

NZS 6806 when tested against an extended range o projects.

The assessment method in NZS 6806 requires consideration o a number o noise mitigationoptions depending on the scale o a project. For a transitional period o two years until May 2012,

the NZTA requires that assessments using NZS 6806 include consideration o a noise mitigation

option complying with the Transit guidelines.

Criteria

Unlike the Transit guidelines, NZS 6806 does not set rigid noise limits. It gives categories (A, B and

C) o noise criteria, and requires that the best practicable option (BPO) be identifed to mitigate

road-trac noise. This process promotes integrated design encompassing a wide range o actors

as well as noise levels. The upper category (C) provides a backstop against adverse health eects

such as sleep disturbance, by requiring the insulation o houses i the external noise would not be

suciently reduced using the BPO.

Catgr Critrin Altrd rads Nw rad Nw rad

> 75,000 AADT

(i in Auckland)

A Primar 64 dB LAq(24h)

57 dB LAq(24h)

64 dB LAq(24h)

B Scndar 67 dB LAq(24h)

64 dB LAq(24h)

67 dB LAq(24h)

C Intrnal 40 dB LAq(24h)

40 dB LAq(24h)

40 dB LAq(24h)

Noise mitigation options are to be assessed and, i practicable, the category A criterion should be

achieved. I this is not practicable, then mitigation should be assessed against category B. However,

i it is still not practicable to comply with categories A or B then mitigation should be implemented

to ensure the internal criterion in category C is achieved.

Mitigation costs

Mitigation options determined using NZS 6806 will typically comprise low-noise road suraces and

noise barriers. I these are not sucient, then building-modifcation such as mechanical ventilation

may be required so windows can remain closed. Use o the new criteria in NZS 6806 to date

(September 2011) has shown:

noisemitigationcostsfornewroadsinurbanareasaregenerallylessthanthenoisemitigation

costs that would arise i the Transit guidelines were applied

dependingontheBPO,noisemitigationcostsformajoralterationstoexistingroads(altered

roads) in urban areas may be more than the noise mitigation costs that would arise i the Transit

guidelines were applied.

13 Value Assurance Committee

minutes, 28 January 2010.

TABLe 1 NZS 6806 critria


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Trminlg

NZS 6806 introduces several new terms. A summary o key terms is provided here, but many

have complex denitions and reerence to NZS 6806 is essential.

Altered road

An existing road that is subject to a change in the horizontal or vertical alignment that without

specifc noise mitigation would cause an increase in road-trac noise above thresholds defned in

NZS 6806.

NZS 6806 applies to new and altered roads. It does not apply to existing roads that are not being

altered. An online screening tool to help determine whether or not NZS 6806 applies to a

particular project is provided on the Transport Noise website (www.acoustics.nzta.govt.nz ).

Maintenance works such as resuracing are not classifed as an altered road project.

Building-modication mitigation

Measures to reduce the eects o internal trac noise levels in buildings include:

acoustic insulation

voice amplifcation systems

building relocation.

Cluster

Any teaching or medical acility; or a minimum o three protected premises and acilities (PPFs)

that are on the same side o the road being assessed, and are not more than 100m rom another

PPF in that group.

Decibels (dB LAeq(24h)

)

Road-trac noise levels under NZS 6806are measured in decibels (dB) as the

A-requency-weighted, time-average level

over 24 hours (LAeq(24h)

). This is the same

unit as the old Transit guidelines.

Design year

10 to 20 years ater the opening o a new or altered road.

Do-nothing

The scenario o no change to the existing road, but with trac growth that would have occurred at

the design year.

Do-minimum

The scenario at the design year o a new or altered road having been constructed, but with no

specifc noise mitigation measures implemented.

Free-eld

The assessment position or road-trac noise has changed. Under the Transit guidelines, road-

trac noise is assessed outside at 1m in ront o a building, including noise reected rom the

building itsel (a acade level). Under NZS 6806 road-trac noise is now assessed at the position

o the building acade excluding noise reected rom the building, as i it wasnt there (a ree-feld

level). A ree-feld level (NZS 6806) is approximately 2.5 dB less than a acade level (Transit

guidelines). To provide consistency within uture assessments, the noise limits rom the Transitguidelines will be reduced by 2.5 dB so that they can then be applied directly to ree-feld levels

under NZS 6806.
http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/


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Protected premises and acilities (PPFs)

Spaces in buildings used or:

residential activities

marae

overnight medical care

teaching (and sleeping) in educational acilities

playgrounds that are part o educational acilities that are within 20m o buildings used or

teaching purposes.

PPFs are the locations where road-trac noise is assessed and or which noise mitigation measures

may be required. NZS 6806 does not apply to PPFs in urban areas that are located more than

100m rom the edge o the closest trac lane or the new or altered road, or PPFs in rural areas

located more than 200m rom the edge o the closest trac lane.

Structural mitigation

Measures to reduce noise such as:

low-noise road surace materials noise barriers (including walls, ences and bunds).

Urban/rural

An urban environment is a main urban area, a satellite urban community or an independent urban

community (Statistics New Zealand). Any area that is not urban is classifed as a rural environment

or the purposes o NZS 6806. Details o these areas are available rom Statistics New Zealand

(www.stats.govt.nz) and the NZTAs Spatial Viewer (https://spatialviewer.nzta.govt.nz/).

Altered road NZTA Spatial Viewer showing urban and rural areas

Structural mitigation

Building-modicationmitigation
http://www.stats.govt.nz/https://spatialviewer.nzta.govt.nz/https://spatialviewer.nzta.govt.nz/http://www.stats.govt.nz/


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NZTA prcsssThe ull assessment process detailed in NZS 6806 requires signifcantly more eort than previous

assessments using the Transit guidelines. However, or many routine NZTA projects, noise

mitigation is not warranted and neither is a ull assessment using NZS 6806. To determine whereNZS 6806 requires mitigation, the NZTA has adopted a three-tiered approach to noise

assessment, as shown in fgure 2. For many projects the Tier 1 and 2 assessments can be quickly

and simply conducted by NZTA project sta without the need or acoustics specialists. Tier 3

assessments are not required on all projects, but do require the use o acoustics specialists.

The let-hand side o fgure 2 shows NZTA state highway project stages. The appropriate tier o

noise assessment varies or each stage, depending on the risk associated with the project. Generally,

or larger higher-risk projects, the more detailed Tier 2 and 3 assessments will be required in earlier

stages. The noise risk associated with the project is determined rom the Tier 1 assessment. The

Tier 1 and 2 noise assessments are conducted separately or each project option. The Tier 3 noise

assessment is only conducted or the preerred option determined in the Scheme Assessment.

Stag Nis assssmnt tirItm

INveSTIGATIoN

Scping

Scoping Report

Schm Assssmnt 1

(easibility/scoping update)

Schm Assssmnt 2

Scheme Assessment Report (SAR)

Tir1Riskassssmnt

Tir3N

ZS6806assssmnt

Tir2NZS6806scrn

ing

High risk

projects

only

Project

dependent

All

projects

High risk

projects

only

Project

dependent

FIGURe 2

Assssmnt prcss

Project

dependent

oPeRATeA

ND

MAINTAIN

DeSIGN

oprat and MaintainConsent compliance

Cnstruct

Implement mitigation

Dsign

Outline Plan o Works

FeASIBILITy

Fasibilit

Project Feasibility Report

Schm Assssmnt 3

Assessment o Environmental Eects

(AEE) / Notice o Requirement

CoNSTRUCT


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14 NZTA (2010) Social and

Environmental Management Form,

PSF/13. www.nzta.govt.nz

Tier 1 Noise risk assessment

A Tier 1 assessment indicates the noise risk associated with a project option. The assessment is a

simple process that can be completed in a matter o minutes by a non-specialist. It is based solely

on the volume o trac at the opening year and the number o protected premises and acilities

(PPFs) within 200m o the proposed alignment. An estimate o these parameters will usually be

sucient to determine the appropriate category in table 2.

The Tier 1 assessment orms part o the Social and Environmental Screen (SES) required by

minimum standard Z/19. The results o the assessment or each project option are to be reported

on separate copies o orm PSF/1314, together with the assessments o other potential social and

environmental eects required by Z/19. As the project progresses through Feasibility, Scoping and

the beginning o Scheme Assessment, the assessment or each current option should be reviewed

and updated as necessary. No reporting other than PSF/13 is required or Tier 1 assessments.

Beside each owchart on the ollowing pages is a list o the tools available to NZTA sta and

consultants. Many o these tools are on the Transport Noise website (www.acoustics.nzta.govt.nz).

Within the website, results rom tools can be saved in a central location or each project.

Instructions or doing this are provided on the website.

Dtrmin th annual aragdail trac (AADT) at thpning ar.

estimat hw man prtctdprmiss and acilitis (PPFs) arwithin 200m th alignmnt.

Dtrmin th rall riskusing th tabls blw.

Cmplt th Scial andenirnmnt Scrn (SeS) nrm PSF/13.

Spatial Viewer

https://spatialviewer.nzta.govt.nz/

PSF/13 & PSG/13

www.nzta.govt.nz

Indiidual rating Annual arag dailtrac (AADT)

Prtctd prmiss andacilitis (PPFs)

Nt applicabl (NA) 50,000pd > 200 PPFs

orall rating Indiidual ratings (AADT/PPFs)

Nt applicabl (NA) eithr NA

Lw risk (L) Bth L

Mdium risk (M) on M and n L r M

High risk (H) on H and n L, M r H

FIGURe 3 Tir 1

TABLe 2 Risk rating

Projects do not always exactly ollow the progression o stages shown in fgure 2. For example, a

project might progress straight rom Feasibility to Scheme Assessment with no Scoping stage, or

there might be a period o several years between Scoping and Scheme Assessment. In these cases,

all relevant tiers o the noise assessment should be completed or reviewed when commencing the

next project stage. For the purposes o noise assessment the Scheme Assessment has been split

into three stages, although the division is not a ormal part o NZTA processes.
http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/forms/docs/psf13-2011.pdfhttp://www.acoustics.nzta.govt.nz./http://www.acoustics.nzta.govt.nz./http://www.acoustics.nzta.govt.nz./https://spatialviewer.nzta.govt.nz/http://www.nzta.govt.nz/http://www.nzta.govt.nz/https://spatialviewer.nzta.govt.nz/http://www.acoustics.nzta.govt.nz./http://www.nzta.govt.nz/resources/state-highway-professional-services-contract-proforma-manual/forms/docs/psf13-2011.pdf


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Tier 2 NZS 6806 screening assessment

NZS 6806 only requires mitigation to be considered in clearly defned circumstances. The purpose

o the Tier 2 assessment is to screen out those project options where mitigation is defnitely not

required. The Tier 2 assessment or each project option should take no more than 5 to 10 minutes

to complete by a non-specialist using the screening tool on the Transport Noise website. The

assessment is made on the basis o estimated details o the project (AADT, surace, gradient) and

the relationship to the nearest PPF.

The Tier 2 noise assessment orms part o the Social and Environmental Assessment (SEA)

required by minimum standard Z/19. For each project option, the one-page results sheet rom the

NZS 6806 screening tool should be appended to orm PSF/13. The orm and screening assessment

should be reviewed and updated as necessary as the project progresses. For Scoping Reports and

Scheme Assessment Reports the Tier 2 noise assessment should comprise just PSF/13 and the

appended results sheets. For a project where no mitigation is required then or statutory approvals

a Road-trac Noise Assessment Report should be prepared based on the screening report

template provided on the Transport Noise website.

Idnti urban/rural aras andPPFs

Dtrmin rad/tracparamtrs

Spatial Viewer

https://spatialviewer.nzta.govt.nz/

Screening toolwww.acoustics.nzta.govt.nz

Cmplt SeA n PSF/13.Attach scrning tl rsults

estimat likl mitigatin

Road-trac noise calculator

Noise barrier design guide

Guide to road surace noise*

Guide to acoustics treatment*

www.acoustics.nzta.govt.nz

* In preparation

PSF/13 & PSG/13

www.nzta.govt.nz

ys

N

Ds

NZS 6806rquir mitigatinptins t bdlpd?

FIGURe 4 Tir 2
https://spatialviewer.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/http://www.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/https://spatialviewer.nzta.govt.nz/


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Tier 3 NZS 6806 assessment

A Tier 3 assessment determines the BPO or noise mitigation. This requires an acoustics specialist.

Cnduct nis mdlling rd-minimum scnari

Cmplt Rad-trac NisAssssmnt Rprt rSAR/Aee



Screening report template


BCR spreadsheet


Noise mitigation cost upload tool


SCHeMe

ASSeSSMeNT2

SCHeMeASSeSSMeNT3

DeSIGN

Updat SeA n PSF/13Prduc Rad-trac NisAssssmnt Rprt r SAR

Prjct tam ll in aluatinmatrix r assssmnt ara

Aran PPFs

ab NZS 6806catgr A?

ys

N

Instigat mitigatin ptins

Calculat BCR r ach ptin

Dtrmin indicati BPo rnis mitigatin

Uplad mitigatin cstcmparisn

Prpar a summar papr rach assssmnt ara

Dtrmin th BPo r nismitigatin

Prduc Rad-trac NisAssssmnt Rprt r Aee

Dlp mitigatin dtailddsign and cnrm that anariatins t mitigatin ar stillth BPo

entr as-built nis mitigatindtails in th RAMM databas

Prduc Rad-trac NisMitigatin Plan (oPW)






* In preparation

PSF/13 & PSG/13

www.nzta.govt.nz

Templates and examples


Matrix template


Report template







* In preparation

Report template


FIGURe 5

Tir 3

SM030, section 8

www.nzta.govt.nz

Drat dsignatin cnditins Model conditions


CoNSTRU

CT

Hld a BPo wrkshp rlarg/high-risk prjcts
http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/http://www.acoustics.nzta.govt.nz/


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Rprting

Minimum standard Z/19 Social and Environmental Management (within SM030) will be updated

to provide outline details o the requirements or Tier 1 and 2 noise assessments or NZTA projects.This includes the use o orm PSF/13 to document the Tier 1 assessment as part o the Social

Environmental Screen, and the Tier 2 assessment as part o the Social Environmental Assessment.

The owcharts on the previous pages indicate when results rom the noise assessment should be

recorded on PSF/13. The ollowing provides guidance and examples o how to use that inormation

to complete PSF/13. More detailed guidance can be ound in PSG/13.

Social and Environmental Screen (SES)

The Tier 1 noise assessment is part o the SES or each option. The assessment is limited to the

identifcation o PPFs and consideration o the opening year trac. At this stage, the frst three

columns o PSF/13 should be completed separately or each alignment option.

Issue

The deault text in column A or the row noise should remain unchanged. The ollowing guidanceor the remaining columns only relates to road-trac noise, but additional inormation may also be

required or construction noise.

Efects

The opening year AADT and approximate number o PPFs should be recorded. A brie summary

should be given o the PPFs (urban/rural area), the existing noise environment and a qualitative

description o the predicted new road-trac noise.

Degree o efect

The degree o eect should be reported as the overall risk obtained rom table 2.

optin dscriptin

Scial and enirnmntal Scrn

Issu

Social and environmental

issues

efcts

Describe the potential social and environmental eects o

the option, including where the option may improve social

and environmental outcomes

Dgr fct

H / M / L / NA

Nis

eg construction noise,trac noise,

maintenance noise,

presence o sensitive

receivers (homes,

schools, hospitals).

opning ar AADT 18,000pd

PPFs within 200m 40 huss

Th prjct is a nw rad in an urban rsidntial

ara. Thr ar n signicant xisting nis

surcs in cls prximit t th PPFs and th

nw rad wuld intrduc a clarl nticabl

nw nis surc.

M

TABLe 3 Scial and enirnmntal Scrn xampl Prjct X

15 NZTA (in preparation) State

highway construction noise guide.


This example only shows road-trac or operational noise eects. The NZTA guide to state

highway construction noise15 provides similar examples or construction noise eects.


13/24


Social and Environmental Assessment (SEA)

The Tier 2 noise assessment is part o the SEA. At this stage the second three columns o PSF/13

should be completed or each option, building on or updating the SES completed previously. The

SEA should occur beore detailed acoustics computer modelling and determination o the BPO or

noise mitigation are undertaken. The SEA should be updated once the noise mitigation has been

determined.

Requirements

I a designation exists and has noise conditions, the CSVue15 reerence should be given with a brie

summary o the conditions. Objective N2 in the NZTAs Environmental plan should always be listed,

as shown in the example below.

Addressing efects and meeting requirements

The specifc action, i mitigation is required, will usually be to undertake a Tier 3 assessment to

determine the BPO in accordance with NZS 6806. However, i the analysis is advanced at the time

the SEA is completed then more specifc details or mitigation should be provided. The estimated

cost or mitigation cannot be given prior to analysis o options. I rom experience it is considered

likely that mitigation will be required then the estimated cost should be marked TBC (to be

confrmed). Once the BPO has been identifed then the approximate cost or noise mitigation canbe determined using the BCR spreadsheet on the Transport Noise website.

In the example below, noise barriers and low-noise road suraces have been identifed as being the

likely noise mitigation options. Detailed analysis to identiy the BPO or noise mitigation is not

expected at this stage. Indicative calculations or proessional judgement based on knowledge o

similar projects are acceptable to determine likely noise mitigation when the SEA is frst completed.

optin dscriptinScial and enirnmntal Assssmnt

Rquirmnts

List all legal requirements and

relevant NZTA social and

environmental objectives

Addrssing fcts and mting rquirmnts

List actions to be taken to meet specifc social and environmental

requirements and objectives and address all eects identifed. Include an

estimated cost.

Spcic actins estimatd cst($)

Dsignatincnditins:

(CSvu 12345, cnditin 5)

Assssmnt in accrdancwith NZS 6806.

Spcic NZTAbjctis:

(Environmental plan N2)

Dtrmin rasnabl

nis rquirmnts whn

sking nw r altring

xisting dsignatins,

including whn dsignating

xisting lcal rads b

using RMA prcdurs.

Cnduct nis mnitring th xisting

nirnmnt.

Cnstruct an acustics cmputr mdl

and calculat nis lls r: xisting,d-nthing, d-minimum and mitigatin

ptins (including an ptin t cmpl

with th Transit guidlins).

Dtrmin th BPo in accrdanc with

NZS 6806.

Th BPo is likl t includ nis barrirs

and lw-nis rad suracs, but th cst

ths cannt b rliabl stimatd at

this stag.

TBC

15 CSVue (www.csvue.com) is the

online database used by the NZTA

or consent management. Contact

the Environment and Urban Design

Team ([email protected]).

TABLe 4 Scial and enirnmntal Assssmnt xampl Prjct X
http://www.csvue.com/http://www.csvue.com/


14/24


Waterview Connection, Sector 1 South, option 1

Bst practicabl ptin

Key to the NZS 6806 process is the determination o the BPO or noise mitigation. The ollowing

provides more detailed guidance on the actions required or NZTA projects during thedetermination o the BPO. This process should ensure the BPO is determined in a robust and

consistent manner.

WS10-04

WS10-05

WS10-03

WS10-06

WS10-07

WS10-08

WS10-11WS10-10

WS10-12WS10-13

WS10-09

WS10-15

WS10-14

WS10-01

WS10-02

1. The project should be split into discreteassessment areas. In urban

environments separate assessment

areas should be used or each side o

the state highway.

2. The project acoustics specialist should develop a number o noise mitigation options oreach assessment area. These should be documented in a summary paper or each

assessment area using the ormats provided on the Transport Noise website (actual

project examples are also provided on the website). One o the mitigation options must

be designed to comply with the Transit guidelines.

Waterview Connection, Sector 1 North, option 1

Waterview Connection, Sector 1 North, option 2 Waterview Connection, Sector 1 South, option 2

KEY

Category A PPF

Category B PPF

Category C PPF

Barrier (with height in m)

15 assessment areas or theTransmission Gully Project

Close-up o one assessment area

2.0m

3.0m

3.0m

2.0m

Japonic

aCres

Apple

Terra

ce

HuanuiSt


15/24


3. The project acoustics specialist should calculate the BCR or each mitigation optionusing the spreadsheet template available on the Transport Noise website. The relative

merits should be added to the assessment area summary paper.

4. The project acoustics specialist should prepare an assessment matrix or eachassessment area using the template on the Transport Noise website. The acoustics

specialist should fll in the assessment or the acoustics criteria and then circulate the

matrices with the options summary papers to the project team. For each assessment

criteria the matrices include a seven-point qualitative rating rom triple-plus to triple-

minus. Early trials proved that a quantitative scoring system could not correctly balance

the dierent criteria in the matrix, as the appropriate weightings change in each

assessment area. The template allows the assessment criteria to be customised so thatthey are relevant to the specifc project and location. As a minimum the criteria should

cover the actors listed in section 6.3 o NZS 6806.

$50k

$350k

$300k

$250k

$200k

$150k

$100k

$0Option 1 Option 2

Cost

Beneft

Option 3 Option 4

$400k

5. All relevant project team members should complete the matrix. The key responses inaddition to acoustics will usually be the landscape/visual and urban design, although all

other disciplines are important in determining the BPO. The NZTA Asset Manager

should contribute to the matrix to ensure operation and maintenance issues are

adequately considered.


16/24


8. Ideally the BPO will be determined by consensus at the noise mitigation workshop. Inmany cases, minor variants to mitigation options will need to be remodelled ollowing

the workshop and reviewed by specifc workshop participants. I consensus cannot be

achieved then a suitably qualifed expert with a holistic view is responsible or balancing

the dierent considerations and judging which option constitutes the BPO.

Best

practicable

option

P r o

j e c

t

m a n a g e r

Region

al

plan

ning

NZTA acousticsspecialist

Acoustics

Consu

ltation

Stru

ctur

es

Urbandesign

Ecology

Proje

ct

engin

eer

Region

al

mainte

nance

NZTAurbandesignadvisor

Plannin

g

Roa

din

g

Vis

ual

/

land

scape

Construction

Stormwater

Social

6. The responses to the matrices should be collated and reviewed by the project manager,planner and acoustics specialist. I the choice o noise mitigation options is clear-cut on

the basis o the assessment matrices then these may be selected as the BPO. For simple

projects it is envisaged that this will oten be the case. For large, complex and high-risk

projects it will usually be necessary to hold one or more noise mitigation workshops to

review the matrices beore determining the BPO.

7. I necessary, hold a noise mitigation workshop. Precirculate the completed assessmentmatrices to all attendees. Attendees may include:

facilitator

NZTAprojectsta

consultantteam:acoustics,planning,social,consultation,roading,structures,visual/landscape, urban design, construction, ecology, stormwater

NZTAnationaloce:acoustics,urbandesign

NZTAregionaloce:planning,maintenance(regionalmaintenancestaarecriticalcontributors as the long-term perormance o the mitigation depends on practicable

maintenance) acousticsadvisorsfromthecouncilortheEnvironmentalProtectionAuthority(EPA)

(observer only as NZS 6806 is a process rather than perormance based standard, itis benefcial or the regulatory authoritys acoustics advisor to be able to witness theprocess so that they can veriy it was correctly implemented).

Not all o these people will be needed or every noise mitigation workshop, and theapproprite attendees should be determined by the NZTA project manager.

Stakeholder engagement

Stakeholder input is required in this process, including rom those people living adjacent toproposed barriers. Ideally, community opinions will be known when completing assessment

matrices and prior to any noise mitigation workshop. Otherwise, the selected options should

remain subject to confrmation ollowing community consultation ater the workshop.


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Case study Transmission Gully Project

The Transmission Gully Project is a proposed new 27km expressway providing an inland route

between Wellington (Linden) and the Kapiti Coast (MacKays Crossing). An assessment o uture

road-trac noise in accordance with NZS 6806 was conducted or the project in 2010. As a large

project aecting a signifcant number o PPFs, a hal-day noise mitigation workshop was held to

determine the BPO or each o the assessment areas. In accordance with the procedures detailed in

this guide, mitigation options were circulated and assessment matrices completed by the project

team prior to the workshop. Participants at the workshop included all those shown in the diagram

opposite, and the EPA acoustics advisor was present to witness the process. In several cases the

BPO was identifed as being a modifcation to one o the options that had been prepared. The

proposed modifcations were tested in the noise model ater the workshop and reviewed/

confrmed by the aected team members at a ollow-up meeting the next day.

Following the workshop the project acoustics specialist and a member o the planning team visited

all building owners adjacent to proposed noise barriers. This included around 30 households, a

primary school, a preschool, a teen-parent unit and a marae. Wherever practicable, wishes o

neighbours were considered. Individual site inspections also allowed building heights to be refned

in the noise model. Any alterations that

materially aected the BPO identifed at

the noise mitigation workshop were then

reviewed with the relevant team members.

As well as balancing noise and visual

considerations, other positive urban

design outcomes rom this process

included the maintenance o a communitywalkway. Initially the noise barriers were

proposed on property boundaries.

However, an area was identifed where this

would sever an inormal, but heavily used

community walkway on crown land. It was

determined at the workshop that the

barrier could be positioned closer to the

road to maintain the walkway behind, but

that the walkway would need to be

ormally established due to the steep

slope in the remaining space available.

The team liaised with the council, which

agreed to accept the land and establish

the walkway. The adjacent residents alsoconfrmed their support or the walkway.

Noise mitigation workshops

To give eect to the process detailed on the previous pages, a noise mitigation workshop needs to

be well planned and organised. This should include the ollowing:

Theacousticsspecialistshouldcompletethenoisemodellingandprepareasummarypaperand

drat assessment matrix or each area at least one month beore the workshop. Allteammembersshouldcompletetheirpartsoftheassessmentmatricesatleasttwoweeks

beore the workshop.

Completeassessmentmatriceswithcollatedresponsesshouldbecirculatedatleastoneweek

beore the workshop.

Theroomusedfortheworkshopshouldbeconguredforaround-tablediscussion,witha

projection screen to display the options being discussed.

Theworkshopshouldbeledbyafacilitator/integratorwithaholisticview.

TheBPOandreasonsforitagreedattheworkshopshouldbedocumentedandcirculated.

AnysubsequentalterationstotheBPOshouldbereviewedandconrmedbytherelevantteam

members.


18/24


Watriw Cnnctin

The Waterview Connection in Auckland is the

largest roading project in New Zealand in recenttimes. It includes 4.5km o new state highway

connecting SH20 with SH16, o which 2.5km will

be in tunnels, as well as alterations to 7km o the

existing SH16. The section between SH20 and

SH16 is unique in that the new surace road is

expected to carry more than 80,000 vehicles per

day and passes through established residential

urban areas with relatively low existing noise

levels. In contrast, the works to SH16 are on a road

carrying around 130,000 vehicles per day through

an urban area already subject to high road-trac noise levels.

In 2010, the Waterview Connection was one o the frst projects where NZS 6806 was used or

road-trac noise assessment. It was also the frst roading project where the notices o requirementor designations and applications or resource consents were submitted to the Environmental

Protection Authority under the RMA national consenting process. This process has a time limit o

nine months, which restricted the time available or the Board o Inquiry to consider and analyse

the development and implementation o NZS 6806.

In its fnal report, the Waterview Board o Inquiry stated the ollowing concerns:

underNZS6806,PPFsinCategoriesAandBmightexperiencehigherinternalnoiselevelsthan

those in Category C

aperceptionthatNZS6806requiresarigiddevelopmentoftheBPO

concernregardingthebalancestruckinNZS6806betweenenablingthecommunityseconomic

and possibly social wellbeing relative to the social wellbeing and health o directly aected people

aperceptionthatNZS6806doesnotprovideasettestormethodologybutoersguidanceand

recommendations.

It is noted that many Category A and B PPFs in the vicinity o that part o the existing SH16 being

altered as part o the project already receive high internal (and external) noise levels as part o the

current (2011) existing environment.

Despite reerring to the concerns noted above in its fnal report, in its fnal decision on the

Waterview designation conditions the Board o Inquiry imposed the amended designation

conditions proposed by the NZTA (in its comments on the Boards drat decision).

For the majority o the Waterview Connection the operational noise conditions imposed by the

Board are completely consistent with NZS 6806. The only signifcant variation rom NZS 6806 is in

relation to a specifc area (Sector 9) where a section o new surace road expected to carry over

80,000 vehicles per day would be constructed through an established quiet residential

neighbourhood. In its comments on the Boards drat report the NZTA accepted that, due to thelevels o trac involved, the situation in relation to Sector 9 is unique in the New Zealand context

and, accordingly, the NZTA accepted the imposition o noise conditions that would require more

noise mitigation than would be required under NZS 6806.

Under the noise conditions applying to Sector 9 only, regardless o what NZS 6806 category a PPF

alls into, road-trac noise levels inside the PPFs are not to exceed 40 dB LAeq(24h)

, with building-

modifcation mitigation required i structural mitigation is not sucient. The NZTA accepts this

condition is appropriate to manage adverse road-trac noise eects in the unique situation

aecting Sector 9.

The NZTA considers NZS 6806 is a robust tool to help assess what are reasonable levels o road

trac noise, and to help determine appropriate mitigation o the noise eects o new and altered

roads. NZS 6806 was subject to the usual committee process or approval o New Zealand

standards and involved a wide range o stakeholders, many with the publics interest as their

responsibility, together with science experts, who considered and weighed the available evidenceand sought wider input through public submissions.

For uture projects, the model conditions on pages 1921 should be promoted by the NZTA.


19/24


Scp wrks

For a Tier 3 assessment (reer to fgure 5) the ollowing items o work should be perormed by an

acoustics specialist. The templates and spreadsheet reerred to are on the Transport Noise website.

Scheme Assessment 2

IdentifyallPPFs,urban/ruralareasandapplicablecriteriafromNZS6806.

ConductasitevisitandnoisesurveyinaccordancewithNZS6806section5.2,forthepurpose

o veriying the noise model or the existing scenario and quantiying the existing environment.

SubmitallsurveyresultstotheNZTAsEnvironmentandUrbanDesignTeam(EUDT)usingthe

template.

ConstructanoisemodelinaccordancewithNZS6806section5.3fortheexisting,do-nothing

and do-minimum scenarios, and determine noise levels at each PPF.

DeterminetheTransitguidelinesdesigncriteria.

I all PPFs are category A or do-minimum, or all levels are within NZS 6806 section 1.5.2thresholds, use the screening report template to prepare a Road-trac Noise Assessment Report

which will be suitable or both the SAR and AEE. No urther work is required.

I any PPFs are in NZS 6806 categories B or C:

GroupPPFsintoassessmentareasandinvestigatemitigationoptionsinthedo-minimumnoise

model, in accordance with NZS 6806 section 7. One option must meet the Transit guidelines.

UsingtheBCRspreadsheet,calculatethebenet,cost,numberofPPFsineachcategory,and

average noise reduction or each mitigation option relative to the do-minimum scenario.

DetermineanindicativeBPOfornoisemitigation.

UploadcostsofmitigationforNZS6806andTransitguidelinesontothewebsite.

UpdateformPSF/13withtheindicativemitigationandcosts.

UsetheSARreporttemplatetoproduceaRoad-tracNoiseAssessmentReport.

Scheme Assessment 3

Prepareanoisemitigationoptionssummarypaperforeachassessmentarea.

Collateprojectteamresponsestocompletetheevaluationmatrixforeachassessmentarea.

Obtaininputfromstakeholdersdirectlyaectedbymitigationoptions.

DeterminetheBPOfornoisemitigationinaccordancewithNZS6806section6.3,usinga

workshop or large/high risk projects (workshop attendees to include the EUDT).

UsetheAEEreporttemplatetoproduceanupdatedRoad-tracNoiseAssessmentReport.

Prepare/presentevidenceandconferencewithotherexpertsasrequiredfortheRMAprocesses.

Design

Designbarriersandconrmlow-noisesurfaces.Coordinateurbandesignandotherrequirements.

ForallPPFsincategoryCdetermineappropriateacousticstreatment.

ConrmvariationstomitigationarestilltheBPO,obtainingapprovalsasrequiredbythe

conditions.

UsetheOPWreporttemplatetoproduceaRoad-tracNoiseMitigationPlan.

Construct

Conductsiteinspectionstoverifyinstallationoflow-noiseroadsurfacesandnoisebarriers.

ForallPPFsincategoryCverifyacousticstreatmenthasbeeninstalledasdetailedinthe

Road-trac Noise Mitigation Plan and individual mitigation agreements.

Ensuredetailsofallnoisebarriersandlow-noiseroadsurfacesareenteredintoRAMM.

SubmitdetailsofacousticstreatmentofPPFstotheEUDTusingthetemplate.


20/24


Dsignatin cnditins

Figure 6 shows which noise standard should be applied to a particular designation.

FIGURe 6 Dsignatin cnditins

Dsignatin

N

ys Us mdl cnditins t gifct t NZS 6806

ys

N

Nw dsignatin?

Altratint dsignatin

rquird?

Spcicdsignatin

cnditins alradxist?

Number oafectedPPFs

< 10 PPFs

10-50 PPFs

> 50 PPFs

Assss mitigatinundr xistingcnditins (tpicallTransit guidlins)

Sk guidanc rmth enirnmnt andUrban Dsign Tam([email protected])

Cnsidr analtratin t thcnditins t applNZS 6806

Spcic

nis cnditinsxist?

N

N Dtrmin an nis mitigatin

rquird using NZS 6806

N

Appl xisting cnditins

(g Transit guidlins)

Cnsidr an altratin t thcnditins t appl NZS 6806

existingcnditins

cmplx, ragmntdand likl t lad t pr

urban dsignutcm?

ys

ys

ys


21/24


Model conditions

It is not possible to prescribe a simplistic perormance standard, such as a noise limit, to the

NZS 6806 process or the results o the process. The BPO is determined by ollowing the correct

process and not by achieving an absolute limit. Recommended designation conditions that

encapsulate the NZS 6806 process are shown below. The conditions provide certainty in the noise

mitigation outcome to be provided, while allowing or development during normal detailed design

processes.

Condition N1

For the purposes o Conditions [N2N12] the ollowing terms will have the ollowing meanings:

a) BPO means the Best Practicable Option.

b) Building-Modifcation Mitigation has the same meaning as in NZS 6806:2010.

c) Habitable Space has the same meaning as in NZS 6806:2010.

d) Noise Assessment

OPTION 1 Build now designation- means the Road-trac Noise Assessment Report [re] submitted with the NOR.

OPTION 2 Route protection designation

- means the Road-trac Noise Assessment Report in accordance with condition [N2].

e) Noise Criteria Categories means the groups o preerence or time-averaged sound levels

established in accordance with NZS 6806:2010 when determining the BPO mitigation option,

ie Category A primary noise criterion, Category B secondary noise criterion and Category C

internal noise criterion.

) NZS 6806:2010 means New Zealand Standard NZS 6806:2010 Acoustics Road-trac

noise New and altered roads.

g) PPFs

OPTION 1 Build now designation- means only the premises and acilities identifed in green, orange or red in the Noise

Assessment.


- has the same meaning as in NZS 6806:2010 or the purpose o the preparation o the Noise

Assessment. Once a Noise Assessment has been prepared in accordance with Condition

[N2], PPFs means only the premises and acilities identifed in green, orange or red in the

Noise Assessment.

h) Structural Mitigation has the same meaning as in NZS 6806:2010.

OPTION 1 Build now designation

Condition N2The NZTA shall implement the road-trac noise mitigation measures identifed as the Selected

Options in the Noise Assessment as part o the Project, in order to achieve the Noise Criteria

Categories indicated in the Noise Assessment (Identifed Categories), where practicable, subject

to Conditions [N3N11] below.


Condition N2

The NZTA shall appoint a suitably qualifed acoustics specialist, a suitably qualifed planner

approved by the Council, and other designers, to determine the BPO or road-trac noise

mitigation in accordance with NZS 6806:2010. No later than 6 months prior to construction

starting, the NZTA shall submit to the Council a Road-trac Noise Assessment Report (Noise

Assessment) detailing the assessment process, Selected Options or noise mitigation, and the

Noise Criteria Categories or all PPFs (Identifed Categories). The NZTA shall implement the

Selected Options or noise mitigation identifed in the Noise Assessment as part o the Project, in

order to achieve the Identifed Categories where practicable, subject to Conditions [N3N11] below.


22/24


Condition N3

The detailed design o the Structural Mitigation measures in the Selected Options (the Detailed

Mitigation Options) shall be undertaken by a suitably qualifed acoustics specialist prior to

construction o the Project, and, subject to Condition [N4], shall include, as a minimum, the

ollowing:

a) Noise barriers with the location, length and height in general accordance with the Noise

Assessment; and

b) Low-noise road suraces in general accordance with the Noise Assessment.

Condition N4

Where the design o the Detailed Mitigation Options identifes that it is not practicable to

implement a particular Structural Mitigation measure in the location or o the length or height

included in the Selected Options either:

a) i the design o the Structural Mitigation measure could be changed and would still achieve the

same Identifed Category or Category B at all relevant PPFs, and a suitably qualifed plannerapproved by the Council certifes to the Council that the changed Structural Mitigation would

be consistent with adopting the BPO in accordance with NZS 6806:2010, the Detailed

Mitigation Options may include the changed mitigation measure; or

b) i changed design o the Structural Mitigation measure would change the Noise Criteria

Category at any relevant PPF rom Category A or B to Category C, but the Council confrms that

the changed Structural Mitigation would be consistent with adopting BPO in accordance with

NZS 6806:2010, the Detailed Mitigation Options may include the changed mitigation measure.

Condition N5

The Detailed Mitigation Options shall be implemented prior to completion o construction o the

Project, with the exception o any low-noise road suraces, which shall be implemented within

12 months o completion o construction.

Condition N6

Prior to construction o the Project, a suitably qualifed acoustics specialist shall identiy those PPFs

which ollowing implementation o all the Structural Mitigation included in the Detailed Mitigation

Options are not in Noise Criteria Categories A or B and where Building-Modifcation Mitigation

may be required to achieve 40 dB LAeq(24h)

inside habitable spaces (Category C Buildings).

Condition N7

a) Prior to commencement o construction o the Project in the vicinity o a Category C Building,

the NZTA shall write to the owner o each Category C Building seeking access to such building

or the purpose o measuring internal noise levels and assessing the existing building envelope

in relation to noise reduction perormance.

b) I the owner(s) o the Category C Building approves the NZTAs access to the property within

12 months o the date o the NZTAs letter (sent pursuant to Condition [N7(a)]), then no more

than 12 months prior to commencement o construction o the Project, the NZTA shall instruct

a suitably qualifed acoustics specialist to visit the building to measure internal noise levels and

assess the existing building envelope in relation to noise reduction perormance.


23/24

A owchart illustrating application o conditions N6 to N11 is provided in the NZTAs State highwayguide to acoustics treatment o buildings.


Condition N8

Where a Category C Building is identifed, the NZTA shall be deemed to have complied with

Condition [N7] above where:

a) The NZTA (through its acoustics specialist) has visited the building; or

b) The owner o the Category C Building approved the NZTAs access, but the NZTA could not

gain entry or some reason (such as entry denied by a tenant); or

c) The owner o the Category C Building did not approve the NZTAs access to the property within

the time period set out in Condition [N7(b)] (including where the owner(s) did not respond to

the NZTAs letter (sent pursuant to Condition [N7(a)] within that period)); or

d) The owner o the Category C Building cannot, ater reasonable enquiry, be ound prior to

completion o construction o the Project.

I any o (b) to (d) above apply to a particular Category C Building, the NZTA shall not be required

to implement any Building-Modifcation Mitigation at that Category C Building.

Condition N9

Subject to Condition [N8], within six months o the assessment required under Condition [N7(b)],

the NZTA shall give written notice to the owner o each Category C Building:

a) Advising o the options available or Building-Modifcation Mitigation to the building; and

b) Advising that the owner has three months within which to decide whether to accept Building-

Modifcation Mitigation or the building, and i the NZTA has advised the owner that more than

one option or Building-Modifcation Mitigation is available, to advise which o those options

the owner preers.

Condition N10

Once an agreement on Building-Modifcation Mitigation is reached between the NZTA and theowner o an aected building, the mitigation shall be implemented (including the NZTA obtaining

any third party authorisations required to implement the mitigation) in a reasonable and practical

timerame agreed between the NZTA and the owner.

Condition N11

Subject to Condition [N8], where Building-Modifcation Mitigation is required, the NZTA shall be

deemed to have complied with Condition [N10] above where:

a) The NZTA has completed Building-Modifcation Mitigation to the Category C Building; or

b) The owner o the Category C Building did not accept the NZTAs oer to implement Building-

Modifcation Mitigation prior to the expiry o the timerame stated in Condition [N9(b)] above

(including where the owner did not respond to the NZTA within that period); orc) The owner o the Category C Building cannot, ater reasonable enquiry, be ound prior to

completion o construction o the Project.

Condition N12

The NZTA shall manage and maintain the Detailed Mitigation Options to ensure that, to the extent

practicable, those mitigation works retain their noise reduction perormance or at least 10 years

ater the opening o the Project to the public.


24/24

This newsletter is printed on environmentally-responsible paper manuactured using FSC-certifed,

mixed-source pulp harvested rom sustainable well-managed orests and bleached using an elemental

chlorine-ree process. All inks in this document are vegetable based and sealers are water based.

our cntact dtails

Furthr inrmatinNZTA Transport Noise website,www.acoustics.nzta.govt.nz

Standards New Zealand (publishers o NZS 6806),www.standards.co.nz

Rob Hannaby

Principal Environmental Specialist

Highways and Network Operations

Proessional Services

Telephone: 09 928 8761

Mobile: 021 242 0853

[email protected]
http://www.acoustics.nzta.govt.nz/http://www.standards.co.nz/http://www.standards.co.nz/http://www.acoustics.nzta.govt.nz/

Guide to Assessing Road Traffic Noise

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